HT instruments HT4011 - Manual (Page 11)

HT4011
EN – 10
4.3.3. Frequency and Duty Cycle measurement
CAUTION
 When measuring frequency with leads, the maximum input AC voltage is
600Vrms. Do not measure voltages exceeding the limits given in this
manual. Exceeding these limits could result in electrical shocks to the
user and damage to the instrument.
 When measuring frequency with the clamp, make sure that all the
instrument's input terminals are disconnected.
Fig. 4: Use of the clamp for frequency measurement and duty cycle
1. Select position , , Hz for measuring frequency with leads.
2. Press the Hz% key cyclically until the symbol “Hz” is displayed for measuring frequency
or the symbol “%” for duty cycle measurement.
3. Insert the red cable into input terminal V

CAPHz%Temp and the black cable into
input terminal COM (Fig. 4 – left side) for measuring frequency with leads. The value of
frequency (Hz) or of duty cycle (%) is shown on the display.
4. If the symbol “O.L” is displayed, this indicates overload status.
5. To use the HOLD function, please refer to § 4.2.